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Suppressors Minimum barrel length on recored TBAC 30BA

Bri0242

Sergeant
Full Member
Minuteman
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Jan 28, 2011
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DFW, TX
What's the minimum barrel length for a recored 30BA, with regards to .308W, 6.5G, 6.8 SPCII, .300BO, .300WM, 6.5PRC and 7.62x39? Is it considered a gen 1 Ultra 7? Thanks